fixed several potential nullptrs

code cleanups
logging enhancements (memory/cpu)
reduced log footprint (diskspace)
fixed some potential layout issues
added comments

app/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 23
-    buildToolsVersion "23.0.2"
+    buildToolsVersion '23.0.3'
 
     defaultConfig {
         applicationId "de.fhws.indoor.sensorreadout"
@@ -20,10 +20,10 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
+    compile fileTree(include: ['*.jar'], dir: 'libs')
     testCompile 'junit:junit:4.12'
     compile 'com.android.support:appcompat-v7:23.4.0'
     compile 'com.google.android.support:wearable:1.3.0'
-    compile 'com.google.android.gms:play-services-wearable:8.4.0'
+    //compile 'com.google.android.gms:play-services-wearable:8.4.0'
     //provided 'com.google.android.wearable:wearable:1.0.0'
 }